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The Effects of Prestrain and Subsequent Annealing on Tensile Properties of CP-Ti

机译：预应变和随后的退火对CP-Ti拉伸性能的影响

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The aim of the present work is to investigate the effects of prestrain and subsequent annealing on tensile properties of commercial pure titanium (CP-Ti). According to tensile test results, yield strength and ultimate tensile strength increase with the increase of prestrain. Elongation and uniform strain decrease linearly with prestrain. In the case of prestrain that is higher than 3.5%, the macro-yield of specimens changes from gradual yielding to discontinuous yielding. It is supposed that considerable numbers of dislocations introduced into the material lead to the appearance of yield plateau. The quantitative analysis of the contribution of dislocation hardening to the strain hardening shows that dislocation-associated mechanisms play an important role in strain hardening. Moreover, a modified Fields-Backofen model is proposed to predict the flow stress of prestrained CP-Ti at different strain rates. Both strain rate sensitivity and strain hardening exponent decrease with prestrain. Fracture surfaces of the specimens show that fracture mechanism of all tested specimens is dimple fracture. The more ductile deformation in prestrained CP-Ti after annealing indicates that its ductility is improved by annealing.
机译：本工作的目的是研究预应变和随后的退火对商用纯钛（CP-Ti）拉伸性能的影响。根据拉伸试验结果，屈服强度和极限抗拉强度随着预应变的增加而增加。伸长率和均匀应变随预应变线性降低。如果预应变高于3.5％，则试样的宏观屈服从逐渐屈服变为不连续屈服。据推测，引入到材料中的大量位错导致屈服平稳的出现。对位错硬化对应变硬化的贡献的定量分析表明，位错相关机制在应变硬化中起着重要作用。此外，提出了改进的Fields-Backofen模型来预测不同应变率下预应变CP-Ti的流应力。应变率敏感性和应变硬化指数均随预应变而降低。试样的断裂面表明，所有试样的断裂机理均为酒窝断裂。退火后，预应变CP-Ti的延性变形更大，这表明退火可改善其延展性。

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